open customize dialog. Entry "Select to Word Right" (.uno:WordRightSel ) exist. Add "Select to Word Left" .uno:WordLeftSel to list of available commands. Uno command works, need only add it to menu.
User Profile Reset: No
User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0
Created attachment 140128 [details]
Ok -> NEW
In fact, .uno:WordLeftSel is also listed, but not with the name "Select to Word Left". It is named as "Select to Begin of Word".